Route information

Description

Used by the repeater to indicate how many times a message has been repeated.

0 – 3
0 = default
3 = do not repeat anymore

Source ID

30

MMSI number of source station.

Sequence Number

2

0 – 3; refer to ITU-R M.1371-3, Annex 2, § 5.3.1.

Destination ID

30

MMSI number of destination station.

Retransmit Flag

1

Retransmit Flag should be set upon retransmission.

0 = no retransmission = default
1 = retransmitted

Spare

1

Not used. Set to zero.

IAI

16

DAC = 001; FI = 28

(See Rec. ITU-R M.1371-3, Annex 5, § 2.1)

Message Linkage ID

10

A source specific running number, unique across all binary messages equipped with Message Linkage ID. Used to link additional information to the message by a Text Description message. The Message Linkage ID and the first six digits of the source MMSI uniquely identify the sent message.